Preparation method of nucleating agent applied to modification and refinement of hypoeutectic aluminum-silicon alloy

An aluminum-silicon alloy, modification and refinement technology, which is applied in the field of aluminum-based alloys, can solve the problems that modification treatment and refinement treatment cannot be carried out at the same time, the refinement effect of hypoeutectic aluminum-silicon alloy is not obvious, and the degree of particle dispersion is not ideal. , to achieve excellent refinement effect, good metamorphic effect, and low raw material price

Active Publication Date: 2018-12-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method for the inoculant used for the modification and refinement of the hypoeutectic Al-Si alloy, which uses the in-situ autogenous reaction method and rapid solidification technology to prepare thin strips of CaB 6 -Al 4 The method of Ca / Al ultra-fine grain inoculant overcomes the fact that the inoculant in the prior art has no obvious effect on the refinement of the hypoeutectic aluminum-silicon alloy, the modification treatment and the refinement treatment cannot be carried out at the same time, and the dispersion degree of the particles on the matrix is ​​not good. Ideal, aggregate precipitation of particles in the melt and defects with large particle size

Method used

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  • Preparation method of nucleating agent applied to modification and refinement of hypoeutectic aluminum-silicon alloy
  • Preparation method of nucleating agent applied to modification and refinement of hypoeutectic aluminum-silicon alloy
  • Preparation method of nucleating agent applied to modification and refinement of hypoeutectic aluminum-silicon alloy

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Embodiment 1

[0043] First step, ingredients:

[0044] Take the commercially available Al-B master alloy and the commercially available Al-Ca master alloy of the required amount, the mass percentage of the B element content in the commercially available Al-B master alloy is 3%, and the commercially available Al-Ca master alloy The mass percentage of Ca element content is 10%, carries out batching according to the mass ratio of Al-B master alloy: Al-Ca master alloy=5:2.5;

[0045] The second step is to prepare bulk Al-B-Ca master alloy:

[0046] Put the raw materials Al-B master alloy and Al-Ca master alloy weighed in the first step above into the copper crucible of WK-II vacuum arc melting furnace for melting, the vacuum degree is 4×10 -3 Pa, then filled with argon, the argon pressure in the furnace is 0.5MPa, the whole melting process needs to be under the protection of argon, and the copper crucible needs to be cooled by circulating water, adjust the current to control the melting temper...

Embodiment 2

[0050] First step, ingredients:

[0051] Take the commercially available Al-B master alloy and the commercially available Al-Ca master alloy of the required amount, the mass percentage of the B element content in the commercially available Al-B master alloy is 2.5%, and the commercially available Al-Ca master alloy The mass percent of Ca element content is 12%, carries out batching according to the mass ratio of Al-B master alloy: Al-Ca master alloy=5:1;

[0052] The second step is to prepare bulk Al-B-Ca master alloy:

[0053] Put the raw materials Al-B master alloy and Al-Ca master alloy weighed in the first step above into the copper crucible of WK-II vacuum arc melting furnace for melting, the vacuum degree is 2×10 -3 Pa, then filled with argon, the argon pressure in the furnace is 0.4MPa, the whole melting process needs to be under the protection of argon, and the copper crucible needs to be cooled by circulating water, adjust the current to control the melting temperatu...

Embodiment 3

[0057] First step, ingredients:

[0058] Take the commercially available Al-B master alloy and the commercially available Al-Ca master alloy of required consumption, the mass percentage of B element content in this commercially available Al-B master alloy is 2%, in this commercially buy Al-Ca master alloy The mass percent of Ca element content is 8%, carries out batching according to the mass ratio of Al-B master alloy: Al-Ca master alloy=5:3;

[0059] The second step is to prepare bulk Al-B-Ca master alloy:

[0060] Put the raw materials Al-B master alloy and Al-Ca master alloy weighed in the first step above into the copper crucible of WK-II vacuum arc melting furnace for melting, the vacuum degree is 5×10 -3 Pa, and then filled with argon, the argon pressure in the furnace is 0.45MPa, the whole melting process needs to be under the protection of argon, and the copper crucible needs to be cooled by circulating water, adjust the current to control the melting temperature, th...

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Abstract

The invention discloses a nucleating agent applied to modification and refinement of hypoeutectic aluminum-silicon alloy and relates to aluminum based alloy. The preparation method comprises the steps: preparing materials according to a mass ratio of Al-B intermediate alloy to Al-Ca intermediate alloy as 5 to (1 to 3); preparing block-shaped Al-B-Ca intermediate alloy; utilizing an in-situ synthesis reaction method and a rapid solidification technology to prepare the nucleating agent applied to modification and refinement of the hypoeutectic aluminum-silicon alloy. The nucleating agent is a thin-stripe-shaped CaB6-Al4Ca/Al ultrafine grain nucleating agent. The nucleating agent disclosed by the invention overcomes the defects that an effect of a nucleating agent in the prior art in refinement of hypoeutectic aluminum-silicon alloy is not obvious, modification treatment and refinement treatment cannot be simultaneously performed, a dispersion degree of particles on a matrix is not ideal,the particles can be gathered and precipitated in melt, and the sizes of the particles are large.

Description

technical field [0001] The technical solution of the invention relates to an aluminum-based alloy, specifically a method for preparing an inoculant for modification and refinement of a hypoeutectic aluminum-silicon alloy. Background technique [0002] At room temperature, hypoeutectic Al-Si alloys mainly consist of a soft and ductile Al matrix and a hard and brittle eutectic Si phase. Hard and sharp eutectic silicon particles have irregular shapes, and the tips and corners of these particles are likely to cause stress concentration, followed by microcracks, which can easily lead to alloy failure. Therefore, the hypoeutectic Al-Si alloy needs to be refined and modified by adding a refiner and a modifier at the same time, so as to improve the plasticity, toughness and strength of the alloy. [0003] At present, common aluminum alloy refiners include Al-5Ti-B refiner and Al-Ti-C refiner. For the Al-5Ti-B refiner, D. Qiu et al. found that Si in the hypoeutectic Al-Si alloy mel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C21/00
CPCC22C1/026C22C1/03C22C1/06C22C21/00
Inventor 崔春翔孙艺佼丁金花刘水清崔森
Owner HEBEI UNIV OF TECH
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